Dresser mounting



Oct. 16, 1951 L, Q, c s 2,571,339

DRESSER MOUNTING Filed Jan. 28, 1949 2 Sheets-Sheet l INVEN TOR. LEO NARD O. CARLSEN Oct. 16, 1951 CARLSEN 2,571,339

DRESSER MOUNTING Filed Jan. 28, 1949 V 2 Sheets-Sheet 2 FIGS INVEN TOR. LEONARD O. CARLSEN BY V ( jAttor-nz] Patented Oct. 16, 1951 DRESSER MOUNTING Leonard 0. Carlsen, Rochester, N. Y., assignor to Gleason Works, Rochester, N. Y., a corporation of New York Application January 28, 1949, Serial No. 73,356

6 Claims.

The present invention relates to machines of the generating type for grinding spiral bevel and hypoid gears, and particularly to means for mounting the wheel-dressing mechanisms on such machines. In a still more specific aspect, the invention relates to a spiral beve1 and hypoid gear grinding machine of the type disclosed in the pending U. S. patent application of William C. Critchley and Herman A. Male, Serial No. 56,144, filed October 23, 1948, which. has issued as Patent No. 2,566,402, dated September 4, 1951, and to means for mounting the wheel-dressing mechanism on such a machine.

In spiral bevel and hypoid gear grinders of the generating type, the tool commonly used is a rotary annular grinding wheel. This wheel is mounted on an oscillatory cradle that is rotated in time with the rotation of the work to produce the generating motion and to cause the wheel to grind correct tooth profiles on the work. To grind gears of different spiral angles, the wheel has to be adjusted on the cradle radially and angularly about the cradle axis.

In conventional spiral bevel and hypoid gear grinders of the generating type, the dressing mechanism is mounted on the cradle so that it is adjustable with the wheel. This has made it difiicult to balance the cradle in all of the different positions to which the dressing mechanism may be adjusted about the axis of the cradle. The speed at which the grinding operation can be performed has heretofore been limited, there- 'fore,gbecause if the cradle is oscillated at high speed vibrations will be set up due to its unbalanced condition.

Because the dressing mechanism has heretofore been mounted on the cradle and adjusted with the wheel, guarding of the wheel has been difficult, and, moreover, the connection of the dressing mechanism with its source of power has been complicated.

All of these difficulties are increased in a grinding machine of the character disclosed in the Critchley and Male application referred to above, for in this machine, the adjustment of the grinding wheel for spiral angle is achieved in part by rotary adjustment of a carrier whose axis is eccentric to the axis of the cradle and angularly in clined thereto. Were the dressing mechanism to be mounted directly on the cradle in this machine, the dressing mechanism would not only have to be adjusted to diiferent angular positions when the wheel is adjusted for diiferent .spiral angles, but would also have to be adjusted 2 to different axial positions relative to the cradle axis for any such adjustment of the wheel.

A primary object of the present invention is to provide a mounting for a dressing mechanism for a spiral bevel and hypoid gear grinding'machine of the generating type through which the weight of the dressing mechanism may be supported independently of the cradle so that the cradle may be operated at high speed for generating the tooth profiles without the dressing mechanism in any wa affecting the balance of the cradle or tending to cause vibration.

Another and concomitant object of the invention is to provide a mounting for the dressing mechanism on a spiral bevel and hypoid gear grinding machine of the generating type in which the wheel may be adjusted for spiral angle independently oi the dressing mechanism and in which the dressing mechanism will have substantially the same position with reference to the cradle in all positions of adjustment of the wheel so that the cradle may readily be balanced.

. Other objects of the invention will be apparent hereinafter from the specification and from the recital of the appended claims.

' The invention has been illustrated in the drawings as applied to a gear grinding machinejof the type described in the Critchley and Male application above mentioned, and it will be described herein in connection with such a machine. It will be understood, however, that it is not limited to such use.

In the drawings: 7

Fig. 1 is a fragmentary view of a machine built according to the Critchley and Male application, looking at the face of the wheel-carrying'cradle and of the upright which supports the same, and showing a dresser support which is constructed according to one embodiment of the invention, mounted in operative relation to the wheel;

Fig. 2 is a fragmentary side elevational view looking from the left of Fig. 1, and showing the positions of the parts when the wheel is in a zero position of its adjustment;

Fig. 3 is a fragmentary axial sectional view showing the mounting of the grinding wheel and further illustrating the mounting for the dresser mechanism; I Fig. 4 is a more or less diagrammatic view showing the wheel adjusted to a different position fromthat of Figs. 2 and 3;

Fig. 5 is a fragmentary detail sectional view showing the connection of the bar, which connects the dresser support to the upright or frame of the machine, with the upright or frame.;. and

Fig. 6 is an elevational view of the carrier or ring upon which the dressing mechanism is supported.

Only so much of the machine of the Critchley and Male application is shown in the drawings as is necessary to an understanding of the present invention.

The grinding. wheel W of this machine is secured to the armature shaft l (Fig. 3) of a motor II which is mounted on an axially reciprocable type sleeve bearing I2 in a slide [4. This slide is adjustable, as described in the application mentioned, to compensate for Wear of the grinding wheel.

The slide I4 and bearing 12 are both mounted in a circular carrier Hi. This carrier is mounted upon plain bearings l6 and I! in a swivel head l8 for angular adjustment about an axis inclined to the axis of the grinding wheel and to the axis of the swivel head. The carrier may be adjusted angularly in the swivel head by rotation of a stub shaft l9 which carries a spur pinion that meshes with a spur gear 2| which is secured to the carrier by screws 22. The swivel head I8 is journaled on plain spaced bearings 24 and 25 for rotatable adjustment in a drum 26 about an axis which is parallel to the axis of the drum.

The adjustment of the swivel head 18 may be affected by rotation of the stub shaft 21 which carries a spur pinion 28 that meshes with a spur gear 29 that is secured to the swivel head by screws 30. The drum 26 itself is mounted for rotatable adjustment on a plain bearing 32 in the cradle 34 for adjustment about an axis parallel to the axis of adjustment of the swivel head l8. Cradle 34 itself is journaled on roller bearings 35 in an upright or support 36, the angular adjustment of the cradle being affected about an axis which is offset from but parallel to the axis of the drum 26.

The dresser mounting, which constitutes the present invention, comprises a support or ring member that is held by an annular gib 4| and screws 42 upon a second ring member 44. The latter is secured by screws 45 to a third ring member 46 that in turn is secured by screws 41 to the carrier IS. The ring 44 constitutes a support upon which the support or ring member 40 is rotatable as the carrier I5 rocks about the cradle axis in the oscillation of the cradle. Support 40 is coaxial with wheel spindle l0.

Support 40 is connected to upright 36 by an adjustable turnbuckle member or bar 5'1. This turnbuckle member is mounted at one end 58 on a ball member 60, and at its opposite end 59 on a ball member 6| (Figs. 2 and 3). Ball member 60 is secured on a stud 62 (Fig. 5) by a disc 66 and by a screw 61 which holds the disc 66 in place. Stud 62 threads into a sleeve member 64. Sleeve member 64 is axially adjustable in a bushing 68 (Fig. 2) that is secured in upright 36 by screws Sleeve member 64 is securable in any adjusted position by a set-screw 10. Ball member BI is mounted, similar to ball member 60, on a stud 63 that threads into a sleeve 65 which is secured in support 40.

The parts are shown in Figs. 2 and 3 with the grinding wheel in a zero position of its angular extreme position of adjustment of the grinding wheel. Here the wheel carrier l5 has been swung about the axis 0 of the swivel head l8 through an angle of from the position shown in Fig. 2. Axis t of the wheel spindle has been swung far enough about the center a of intersection of the two axes t and u that the axis 12 of the swivel head bisects the angle between the axis t and the axis 2 of the eccentric drum 26. The plane T of the tip of the grinding wheel is now inclined to the central plane P of the machine.

It will be noted that in this adjustment, the bar 51, which connects the ring support 40 with upright 36, prevents the dresser mechanism 50 from shifting position with the wheel and carrier Hi. In this adjustment, therefore, the supporting ring 44 revolves in the ring support 40, and the turnbuckle member 51 swings angularly so that it may accommodate itself to the new angular position of the grinding wheel. In the generating operation, also, the ring member 40 rocks back and forth on the supporting ring 4| and the turnbuckle 51 rocks back and forth on the two ball joints which connect its opposite ends to the ring 40 and the column 36, respectively. Regardless of adjustment of the grinding wheel or of oscillation of the cradle, then, the dressing mechanism remains in relatively fixed position. It does not shift position on the cradle; and so far as the dressing mechanism is concerned, then, the cradle remains in balance. Thus, the cradle may be operated at high speed.

The sleeve member 84 is adjusted to suit the angular position of the grinding wheel and then locked in place by the set-screw 10. The lateral adjustment of dresser mechanism 50 on ring support 40 permitted by tongue 52 allows of positioning the diamond for wheels of diiferent diameters. Turnbuckle 51 is adjusted to adjust the length of the connecting bar to compensate for lateral adjustment of the dresser mechanism on support 40.

While the invention has been described in connection with a particular embodiment thereof, it will be understood that it is capable of further modification, and this application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention, and including such departures from the present disclosure as come within known or customary practice in the gear art and as may be applied to the essential features hereinbefore set forth and as fall within the scope of the invention or the limits of the appended claims.

Having thus described my invention, what I claim is:

1. In a machine for grinding gears in a generating operation, the combination with a cradle, a housing in which the cradle is oscillatably mounted, a carrier angularly adjustable on the cradle about an axis offset from the axis of the cradle, and a grinding wheel journaled rotatably in said carrier, of a support rotatably mounted on said carrier, a bar pivotally connected at one end to said support and pivotally connected at its opposite end to the housing, and wheel dressing mechanism mounted on said support.

2. In a machine for grinding gears in a generating operation, the combination with a cradle, a housing in which the cradle is oscillatably mounted, a carrier angularly adjustable on the cradle about an axis offset from and angularly disposed to the axis of the cradle, and a grinding wheel journaled rotatably in said carrier with its axis inclined to the axis of the carrier, of a support rotatably mounted on said carrier for rotation about an axis coinciding with the axis. of the wheel, means connecting said support to said housing, and wheel dressin mechanism mounted on said support.

3. In a machine for grinding gears in a generating operation, the combination with a cradle, a housing in which the cradle is oscillatably mounted, a carrier angularly adjustable on the cradle about an axis offset from and angularly disposed to the axis of the cradle, and a grinding Wheel journaled rotatably in said carrier with its axis inclined to the axis of the carrier, of a support rotatably mounted on said carrier for rotation about an axis coinciding with the axis of the wheel, a bar havin a universal joint connection at one end to the support and having a universal joint connection at its opposite end to the housing, and wheel dressing mechanism mounted on said support.

4. In a machine for grinding gears in a generating operation, the combination with a cradle, a housing in which the cradle is oscillatably mounted, a carrier angularly adjustable on the cradle about an axis offset from and angularly disposed to the axis of the cradle, and a grinding wheel journaled rotatably in said carrier with its axis inclined to the axis of the carrier, of a support rotatably mounted on said carrier for rotation about an axis coinciding with the axis of the wheel, a ball-headed pin slidably mounted in said housin for adjustment in the direction of the axis of the cradle, a bar mounted at one end on the head of said pin, a second ball-headed pin on which the opposite end of the bar is mounted, said second ball-headed pin being secured in said support, and wheel dressing mechanism mounted on said support.

5. In a machine for grinding gears in a generating operation, the combination with a cradle, a housing in which the cradle is oscillatably mounted, a carrier angularly adjustable on the cradle about an axis offset from and angularly disposed to the axis of the cradle, and a grinding wheel journaled rotatably in said carrier with its axis inclined to the axis of the carrier, of a support rotatably mounted on said carrier for rotation about an axis coinciding with the axis of the wheel, a ball-headed pin slidably mounted in said housing for adjustment in the direction of the axis of the cradle, a bar mounted at one end on the head of said pin, a second ball-headed pin on which the opposite end of the bar is mounted, said second ball-headed pin bein secured in said support, and wheel dressing mechanism mounted on said support for lateral adjustment thereon, said bar being adjustable as to length.

6. In a machine for grinding gears, the combination with a housing, a supporting member adjustable angularly in said housing, a carrier angularly adjustable on said member about an axis angularly disposed to the axis of adjustment of said member, a rotary Spindle journaled in said carrier with its axis inclined to the axis of adjustment of said carrier, and a grinding wheel secured to said spindle, of a support rotatable'on said carrier about an axis coincidin with the axis of the spindle, means directly connecting said support to the housing, to permit movement of the support independently of the supporting member, carrier, and spindle and wheel dressing mechanism mounted on said support.

LEONARD O. CARLSEN.

Name Date I-Iattersley et a1. July 18, 1911 Number 

